Portion of a LED bulb



FIG. 1 is a perspective view of a portion of a LED bulb showing my new design;

FIG. 2 is another perspective view thereof;

FIG. 3 is a front view thereof;

FIG. 4 is a rear view thereof;

FIG. 5 is a left side view thereof;

FIG. 6 is a right side view thereof;

FIG. 7 is a top view thereof; and,

FIG. 8 is a bottom view thereof.

The broken lines showing in the views are for the purpose of illustrating environmental structure and form no part of the claimed design. 

CLAIM The ornamental design for a portion of a LED bulb, as shown and described. 